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A fluidsynth Qt GUI Interface


qsynth [options] [soundfonts] [midifiles]

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Qsynth is a fluidsynth GUI front-end application written in C++ around the Qt 4 toolkit. Eventually it may evolve into a softsynth management application allowing the user to control and manage a variety of command line softsynth but for the moment it wraps the excellent FluidSynth.


-n, --no-midi-in

Don’t create a midi driver to read MIDI input events [default = yes]

-m, --midi-driver=[label]

The name of the midi driver to use [oss,alsa,alsa_seq,...]

-K, --midi-channels=[num]

The number of midi channels [default = 16]

-a, --audio-driver=[label]

The audio driver [alsa,jack,oss,dsound,...]

-j, --connect-jack-outputs

Attempt to connect the jack outputs to the physical ports

-L, --audio-channels=[num]

The number of stereo audio channels [default = 1]

-G, --audio-groups=[num]

The number of audio groups [default = 1]

-z, --audio-bufsize=[size]

Size of each audio buffer

-c, --audio-bufcount=[count]

Number of audio buffers

-r, --sample-rate=[rate]

Set the sample rate

-R, --reverb=[flag]

Turn the reverb on or off [1|0|yes|no|on|off, default = on]

-C, --chorus=[flag]

Turn the chorus on or off [1|0|yes|no|on|off, default = on]

-g, --gain=[gain]

Set the master gain [0 < gain < 10, default = 0.2]

-o, --option [name=value]

Define a setting name=value

-s, --server

Create and start server [default = no]

-i, --no-shell

Don’t read commands from the shell [ignored]

-d, --dump

Dump midi router events

-v, --verbose

Print out verbose messages about midi events

-h, --help

Show help about command line options

-V, --version

Show version information


Qsynth is written by Rui Nuno Capela <rncbc[:at:]rncbc[:dot:]org> Richard Bown <bownie[:at:]bownie[:dot:]com> Chris Cannam <>

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